我正在尝试在 Xamarin.Forms 中读取 QRCode。我在 XF 中有一个共享项目。我已经为 ZXing.Net 添加了 nuget 包。在 iOS 项目中一切正常。我在 Android 项目中遇到错误。我通过 Android SDK Monitor 得到的错误，它表明扫描仪存在问题并且无法访问。我猜我在 Android 端有一些设置不正确。有人在我的代码中看到任何不当之处吗？谢谢你的时间。
ScanPage class:
public class ScanPage : ContentPage
{
ZXing.Net.Mobile.Forms.ZXingScannerView zxing;
ZXingDefaultOverlay overlay;
bool isConnected = false;
string basicUrl = "golfeventscores.azurewebsites.net";
public ScanPage ()
{
zxing = new ZXing.Net.Mobile.Forms.ZXingScannerView
{
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
AutomationId = "zxingScannerView",
};
zxing.OnScanResult += async (ZXing.Result result) => {
zxing.IsAnalyzing = false;
zxing.IsScanning = false;
var teamToken = result.Text;
//MessagingCenter.Send<string>(teamToken, "SelectTeamMembers");
isConnected = await Plugin.Connectivity.CrossConnectivity.Current.IsRemoteReachable(basicUrl);
if (isConnected)
{
await GetTeamData(teamToken);
}
else
{
await DisplayAlert("Connectivity", "There is a problem with internet connectivity. Please try and reload this screen.", "Ok");
}
};
overlay = new ZXingDefaultOverlay
{
TopText = "Hold your phone up to the barcode",
BottomText = "Scanning will happen automatically",
ShowFlashButton = zxing.HasTorch,
AutomationId = "zxingDefaultOverlay",
};
overlay.FlashButtonClicked += (sender, e) => {
zxing.IsTorchOn = !zxing.IsTorchOn;
};
var grid = new Grid
{
VerticalOptions = LayoutOptions.FillAndExpand,
HorizontalOptions = LayoutOptions.FillAndExpand,
};
grid.Children.Add(zxing);
grid.Children.Add(overlay);
// The root page of your application
Content = grid;
}
protected override void OnAppearing()
{
base.OnAppearing();
zxing.IsScanning = true;
}
protected override void OnDisappearing()
{
zxing.IsScanning = false;
base.OnDisappearing();
}
async System.Threading.Tasks.Task GetTeamData(string Token)
{
try
{
var scanResult = await WebServices.ws.TokenLookup(Token);
if (scanResult.Result == true)
{
if (scanResult.IsScoreBoard == true)
{
var uri = new System.Uri(scanResult.ScoreboardUrl);
Device.BeginInvokeOnMainThread(() =>
{
Device.OpenUri(uri);
Navigation.PopToRootAsync();
});
}
if (scanResult.IsCharity == true)
{
if (scanResult.TeamPlayers.Count > 0)
{
var player = scanResult.TeamPlayers.First();
var playerId = player.PlayerTeamId;
var urlResult = await WebServices.ws.ServerUrl(Token, playerId);
if (urlResult.ValidRequest && (!String.IsNullOrEmpty(urlResult.Url)))
{
var uri = new System.Uri(urlResult.Url);
Device.OpenUri(uri);
await Navigation.PopToRootAsync();
}
}
else{
await DisplayAlert("Scanning", "There was a problem downloading the Charity Team Info.", "OK");
}
}
else
{
if (scanResult.IsLargeGame != true)
{
var select = new Pages.SelectTeamMembers(Token);
await Navigation.PushAsync(select);
}
else
{
await DisplayAlert("Large Game", "Don't have the large team game setup with scanning.", "Ok");
}
}
}
else
{
await DisplayAlert("Server Problem", "There was some type of server error. Please try again or call Wally.", "Ok");
}
}
catch(System.Exception sysExc)
{
//nothing seems to be caught
}
}
}
MainActivity.cs contents:
[Activity (Label = "TD Scan", Icon = "@drawable/icon", Theme="@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
protected override void OnCreate (Bundle bundle)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
base.OnCreate (bundle);
global::Xamarin.Forms.Forms.Init (this, bundle);
ZXing.Net.Mobile.Forms.Android.Platform.Init();
LoadApplication (new GolfGameScanApp.App ());
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
{
ZXing.Net.Mobile.Android.PermissionsHandler.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
}